ABB ACA 6 Series Hardware Manual page 6

Safety Instructions
iv
In ACx 600 frequency converters, control boards of the converter unit
may be at the main circuit potential. Dangerous voltages may be
present between the control boards and the frame of the converter unit,
when the main circuit voltage is on. It is critical that the measuring
instruments, such as an oscilloscope, are used with caution and safety
always as a priority. The fault tracing instructions give special mention
of cases in which measurements may be performed on the control
boards, also indicating the measuring method to be used.
Live parts on the inside of doors are protected against direct contact.
Special safety attention shall be paid when handling shrouds made of
sheet metal.
Do not make any voltage withstand tests on any part of the unit while
the unit is connected. Disconnect motor cables before making any
measurements on motors or motor cables.
WARNING! Close switch fuses of all parallel connected inverters
before starting the frequency converter.
Do not open the drive section switch fuses when the inverter is
running.
Do not use Prevention of Unexpected Start for stopping the drive
when the inverter is running. Give a Stop command instead.
CAUTION! Fans may continue to rotate for a while after the
disconnection of the electrical supply.
CAUTION! Some parts like heatsinks of power semiconductors and
toroidal cores on motor cables inside of cabinet remain hot for a while
after the disconnection of the electrical supply.
ACS 600 MultiDrive